waitFor
If the Secure Backup required mode is set the client `.well-known` file, then this will ensure that everyone already inside the app is required to complete setup matching that policy. Fixes https://github.com/vector-im/element-web/issues/14954
This removes all buttons to escape the Secure Backup setup flow when the matching `.well-known` setting is set by homeserver. Part of https://github.com/vector-im/element-web/issues/14954